Ruling device



April 18, 1950 R. J. CASHMAN 2,504,300

RULING DEVICE Original Filed Feb. 9, 1944 INVENTOR.

* otimzym Patented Apr. 18, 1950 RULING DEVICE Robert J. Cashman,Glenview, Ill., assignor, by mesne assignments, to Research Corporation,New York, N. Y., a corporation of New York Original application February9, 1944, Serial No. 521,594. Divided and this application August 31,1948, Serial No. 47,019

2 Claims.

1 This invention relates to a device for ruling grid lines on theinterior surface of a cylindrical envelope, such as used for photocellsand other like electrical apparatus, and the principal oblaterallyextending trunnion pins 96, which are adapted to snugly seat withinnotches 9'! provided along the upper surface of the semicylindricalbearing iii. The notches are spaced ject of the invention is to providea device of 5 apart a distance corresponding to the distance thischaracter which is simple in construction desired between grid lines,which, preferably, is and yet permits the grid lines to be laid downabout one-fifteenth of an inch. with speed and accuracy. The cell whichis to receive the glld ruling is The present application is a divisionof my clamped to the base 96 by adjustable clamps 98, earlierapplication filed February 9, 1944, Serial l0 which firmly hold theenvelopes St in an appro- No. 521,594, which has matured into Patent No.'priate position to receive the end of the arm S i 2,448,517, issuedSeptember '7. 1948. and the bow pen 95. The lines are ruled onto Furtherand other objects and advantages will the interior surface of theenvelope 89 by robecome apparent as the disclosure proceeds and tatingthe arm 9% and shaft 35 in the associthe description is read inconjunction with the ated bearing 92, and a handle Hit is providedaccompanying drawings in which for convenience of manipulation. After agrid Fig. 1 is a plan view showin a preferred form line has been ruled,the bearing 92 is moved of the ruling device; rearwardly a notch and thenext line ruled, and

Fig. 2 is an elevational view of the same; and the procedure continuesuntil the desired num- Figs. 3 and 4.- are vertical sectional viewstaken ber of lines has been ruled to produce a cell of on the line 33and 4-4 of Figs. 1 and 2 rethe desired resistance values and targetarea. spectively. In using Aquadag, or any similar conducting Referringnow to the drawings, the reference material, the suspension should be asconcencharacter 99 designates a photocell in the proctrated as possiblewithout interferin with proper ess of fabrication and it comprises aglass en fiowage of the material through the bow pen 95. velope upon theinterior cylindrical surface of I claim: which a photo-conductivematerial such as de- 1. Apparatus for ruling lines at fixed interscribedin my prior application hereinbefore revals upon the interiorcylindrical surface of an ferred to is applied over the fine conductinggrid. envelope comprising means for rigidly holding The grid comprises aplurality of parallel conthe envelope, a rotary member provided with aducting lines, alternate ones of which are inruling device at one endadapted to project into terconnected to form opposite sides of anelecthe envelope, a hollow cylinder rotatably suptrical circuit with thephoto-conductive element porting the other end of said member, and meansinterposed as a resistance element between the for fixing thelongitudinal position of the mem intercalated grid lines. All of this isdescribed her within the envelope at regular intervals along in my priorapplication before referred to and the axis of the envelope, saidlast-named means need not be further described here. comprising asemi-cylindrical guideway adapted The grid lines are preferably formedof a mato receive said cylinder and having notches reterial known asAquadag, manufactured by cessed along its side walls corresponding tosaid the Atcheson Colloidal Graphite Company of 4 intervals, andtrunnions projectin from the cyl- Port Huron, Michigan, this productbein an inder selectively engageable with said notched reaqueouscolloidal graphite suspension. Other cesses. materials may be used, asfor example, a graphite 2. Apparatus for ruling lines at fixed intervalspencil. upon the interior cylindrical surface of an en- Whcn the grid isapplied to the cell by ruling, velope comprising means for rigidlyholding the it is convenient to use the device shown in Figs. envelope,a rotary member provided with a rul- 1 to 4 inclusive. This deviceconsists of a 'base ing device at one end adapted to project into the 99having a semi-cylindrical bearing 9| at one envelope, a hollow cylinderrotatably supporting end adapted to receive a relatively heavy hollowthe other end of said member, and means for cylinder 92 within which ashaft 35 is rotatably fixing the longitudinal position of the membersupported by adjustable stop collars 86 and 81. The shaft is hinged at93 to an arm $4 carrying a bow pen or other marker 95 at its extremeend. The cylinder 92 is provided with within the envelope at regularintervals along the axis of the envelope, said last-named meanscomprising a semi-cylindrical guideway adapted to receive said cylinderand having notches re- REFERENCES CITED The following references are ofrecord in the file of this patent:

UNITED STATES PATENTS Number Number Name Date 4 Monro Jan. 12, 1915FOREIGN PATENTS Country Date Denmark Dec. 11, 1905 Germany Oct. 8, 1912Austria Aug. 25, 1913

